Typhoon cannot talk to F-22
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It's an old argument. Link was never a "receive only" option. You have to ransmit to be part of the net. I recall our bomber boys wanting the same thing - so they could get an air picture without emmisions. You can't be positioned in a grid if you're not part of it. Now look what's happened.
You can't be positioned in a grid if you're not part of it.
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My understanding was that if you're not contributing to the net, the kit doesn't need to transmit because it doesn't need to register itself to establish a transmission slot. It just listens to everyone else's messages?
If any of these three parameters increases the TQ goes down, below a certain TQ threshold or after a certain pre-set amount of timeslots has passed,every unit needs to an RTT exchange which means 2 way communication by definition, so all in all there will inevitably be 2 way (sending/receiving) moments for everyone that uses Link-16.
Could be wrong though, but that's basically how I remember it.
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You can most certainly be in the link on receive only. I know a chap, let's call him my brother, who did exactly that just the oher day.
As far as only using it as a receiver, I don't know how long it takes for the TQ to degrade for every different system and how much info you can receive comparing the different methods of data-packaging (standard double pulse -> 4 single pulse).
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There are solutions in work:
LINK
The U.S. Air Force says it has successfully tested a classified information transmission technology from two F-22 Raptor 5th generation fighter aircraft to ground stations at the recent Joint Expeditionary Force Experiment (JEFX 08) exercise at Nellis Air Force Base in Nevada and Langley Air Force Base in Virginia with new tactical targeting network technology under development by Rockwell Collins. …….
During the exercise, two Lockheed Martin F-22 Raptors tested a new method for universal F-22 connectivity with an experimental version of the Rockwell Collins' Tactical Targeting Network Technology (TTNT). For the first time F-22 sensor data was down-linked to the Combined Air Operations Center (CAOC) using a tactical network. In a previous test performed as part of JFEX08-2 earlier this year, images were transmitted from an F-22 to an F-16 via a ground based gateway. Through this experiment, the new radio successfully sent classified sensor data to ground stations at Nellis and Langley Air Force Bases, which then relayed the data to airborne F-16s. According to Col. Moulton, the test provided essential support for further development of future. Battlefield Airborne Communications Node ( BACN) assets and a future ground mobile gateway are designed to support joint air and ground operations.
During the exercise, two Lockheed Martin F-22 Raptors tested a new method for universal F-22 connectivity with an experimental version of the Rockwell Collins' Tactical Targeting Network Technology (TTNT). For the first time F-22 sensor data was down-linked to the Combined Air Operations Center (CAOC) using a tactical network. In a previous test performed as part of JFEX08-2 earlier this year, images were transmitted from an F-22 to an F-16 via a ground based gateway. Through this experiment, the new radio successfully sent classified sensor data to ground stations at Nellis and Langley Air Force Bases, which then relayed the data to airborne F-16s. According to Col. Moulton, the test provided essential support for further development of future. Battlefield Airborne Communications Node ( BACN) assets and a future ground mobile gateway are designed to support joint air and ground operations.
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That might be true but after a certain amount of time slots , every Link-16 unit does an automatic RTT, it's nor nearly as big as the actual DATA transfer blocks but it's there nonetheless and it's by nature 2 way communication.
actively = 2 way communication or
passively = not two way communication.
IIRC this general problem once resulted in the Italians complaining they couldn't speak to Nimrod. I'm not sure about today, but not so long ago it wasn't policy to have this degree of interoperability. Somewhere, someone will be saying "Not a story, because not a requirement."
Could be wrong though, but that's basically how I remember it.
However, coarse synchronisation also permits data to be received, provided that the user is on the right net with the correct cryptovariables. Transmission is not possible in coarse synchronisation.
If PPLIs are received, fine synchronisation can still be obtained using passive synchronisation; the JU will then be able to contribute in its assigned time slot as soon as the transceiver is switched to active mode.
Link16 is pretty amazing. I recall flying a VC10K3 back across the UK from a North Sea towline 13 years ago with the L16 in receive only mode - and still seeing F3s reported by an E-3D over Cumbria. We didn't lose the SRAP until we were on the final approach at Brize!
Transmitting on the ground certainly used to be prohibited. But fighter crews sitting on high readiness states whilst on exercise could get a lot of SA by using the SRAP to view the antics of their colleagues!
Ecce Homo! Loquitur...
F-22 has a directional datalink, IFDL, to exchange formation between formation elements. It is not compatible with other data links. It was intended to upgrade the F-22 to be compatible with other platforms, that hasn't been funded.
The F-35 will have a similar directional datalink, MADL, to exchange formation data, which is not L16 compatible.
The only way to integrate these platforms with existing L11/L16/MIDS/L22 platforms is through an ACN/ BACN
In future the F-35 will use SATCOM to link through ground relays to transmit and receive data to be shared with non-stealthy platforms, but that has slipped to the Block 4 software build, and does require a view of a satellite, which is a major concern in the higher latitudes for both Canada and Norway.
Don't have a BACN or a SATCOM system? Too bad........
The F-35 will have a similar directional datalink, MADL, to exchange formation data, which is not L16 compatible.
The only way to integrate these platforms with existing L11/L16/MIDS/L22 platforms is through an ACN/ BACN
In future the F-35 will use SATCOM to link through ground relays to transmit and receive data to be shared with non-stealthy platforms, but that has slipped to the Block 4 software build, and does require a view of a satellite, which is a major concern in the higher latitudes for both Canada and Norway.
Don't have a BACN or a SATCOM system? Too bad........
PS - If I recall correctly there was a silent mode that threw up a SIL caption on the JTIDS Control Panel. There was no transmitting going on but I would certainly get the picture.
BACN is a cracking piece of kit. I used it a lot in Afghanistan. It used the Global Express as a platform - now there's simething useful we can do with Sentinel!
The first time I used it, it was flying on a WB-57 Canberra!
LJ
The first time I used it, it was flying on a WB-57 Canberra!
LJ
Last edited by Lima Juliet; 23rd Feb 2013 at 08:55.